[PATCH] Make git log work for git CWD outside of work tree

[Danny Sauer <danny@dannysauer.com>]

Make git log's `--use-mailmap` argument works if the GIT_DIR & GIT_WORK_TREE
env vars are set and git is run from outside of work tree.  Without the
NEED_WORK_TREE set on the log subcommand, .mailmap is silently not found.

Signed-off-by: Danny Sauer <danny@dannysauer.com>
---

Notes:
    I'm not entirely sure if this is the best way to fix it, as my git
    internals knowledge is pretty weak. But this /seems/ reasonable to me, and
    passes all of the current test cases.  If there's a more appropriate way to
    make `--use-mailmap` work properly when `git log` is run outside of the
    tree, I'd be excited about the opportunity to learn. :)

 git.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git.c b/git.c
index 8ff44f0..e147f01 100644
--- a/git.c
+++ b/git.c
@@ -440,7 +440,7 @@ static struct cmd_struct commands[] = {
 	{ "init", cmd_init_db },
 	{ "init-db", cmd_init_db },
 	{ "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
-	{ "log", cmd_log, RUN_SETUP },
+	{ "log", cmd_log, RUN_SETUP | NEED_WORK_TREE },
 	{ "ls-files", cmd_ls_files, RUN_SETUP | SUPPORT_SUPER_PREFIX },
 	{ "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 	{ "ls-tree", cmd_ls_tree, RUN_SETUP },
-- 
2.7.4